Decorating An Red Velvet Cake

HiI have promised a friend of mine red velvet cake as a present for his house warming party. Now I know he and his wife love red velvet with cream cheese frosting, but do i use normal buttercream to do some scroll work on it? Or how does it work?

I even want to put an edible image on the cake. The edible image will be printed on rice paper, thats what the bakery from where i will be printing it told me. So how do i go about placing it on the cake. Any do's dont's?

This is my first time handling an edible image and all your responses will be appreciated